OpenSSL::PKey::EC#group

static VALUE
ossl_ec_key_get_group(VALUE self)
{
    OSSL_3_const EC_KEY *ec;
    const EC_GROUP *group;

    GetEC(self, ec);
    group = EC_KEY_get0_group(ec);
    if (!group)
        return Qnil;

    return ec_group_new(group);
}